{
  "body": "K.L. Page, P.A. Evans (U.Leicester) and M.H. Siegel (PSU) report on behalf\nof the Swift-XRT Team:\n\nOn 2025 March 21 at 07:26 UT, Swift started observing EP250321a, 4.6 ks\nafter the Einstein Probe trigger (GCN Circ. 39800). A\npreviously-uncatalogued X-ray source was identified, at a position of RA,\nDec = 179.26259, +17.3628, which is equivalent to\n\nRA (J2000): 11h 57m 03.02s\nDec (J2000): +17d 21' 46.1\"\n\nwith an uncertainty of 2.6 arcsec (radius, 90% confidence). This\nis consistent with the position of the optical and NIR source reported\n(GCN Circs. 39804, 39805, 39807, 39809, 39810).\n\nThe first snapshot of data, spanning 4.6-6.2 ks after the trigger,\nshows some X-ray flaring, with a mean X-ray flux of 3.7 (+0.4, -0.4) x\n10^-11 erg cm-2 s-1 (observed, 0.3-10 keV).\n\n",
  "subject": "EP250321a: Swift-XRT detection of an X-ray source",
  "circularId": 39811,
  "submittedHow": "email",
  "bibcode": "2025GCN.39811....1P",
  "eventId": "EP250321a",
  "createdOn": 1742555887475,
  "submitter": "K.L. Page at U Leicester <klp5@leicester.ac.uk>"
}